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My 1914 date of manufacture WebleyMkVI had cylinder throats which varied from .449-.452. After DougGuy uniformed them to .4555", using soft cast .455" bullets with 3.5 grains of Bullseye, accuracy is stellar! I use Accurate 45-262H cast 1:40 tin-lead.

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Interesting thread. A buddy has a Webley that is cut for 45 acp. He has not shot it a lot but does shoot factory 45 acp loads. I need to get in touch with him after reading this.

to add fuel to the fire here... I have owned several 1917 Smiths in 45 acp. They of course are not top break guns which are not as strong all else being equal. But... One of my 1917's was sent to england. it has brit proof marks all over it. One of the proof marks is "6 tons" which is the same as a Webley.. Not sure that really means anything.

...One of my 1917's was sent to england. it has brit proof marks all over it. One of the proof marks is "6 tons" which is the same as a Webley.. Not sure that really means anything.

Ballistics In Scotland can give the authoritative answer, but if my understanding is correct, the British use a different measuring system in which the set-back of the base of an oiled case in the chamber is used to compress the crusher, rather than the Rodman-type radial copper system formerly used in this country before the adoption of piezoelectric gages in the 1980s or so. I believe the "6 tons" is expressed in "Imperial" or "Long Tons", which are 2240 pounds, versus 2000 pounds for US tons. So six long tons is 13,440 lbs., which sounds about right.

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